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‘Although energetically advantageous when swimming near the water surface, both wave-riding and porpoising have been described for only a limited number of marine mammal species moving at high speeds.’

‘I shot off reel after reel of film on the oceanic birds following the ship, shared in the watch on the depth finder, watched whales in the distance and penguins porpoising through the water like flying fish.’

‘But down by the water's edge porpoising adelie penguins are jumping ashore clean, wet and plump from the icy Southern Ocean.’

‘Several adelies are porpoising between the new islands and the ice.’

‘One way around this limitation would have been to adopt a swimming style known as porpoising.’

‘The approach to James Ross is through the Antarctic Sound, a beautiful stretch of water teeming with wildlife - the ship was joined by hundreds of penguins porpoising along, as well as humpback whales and countless seabirds.’